Floating reamer



March 13,1945. v, H N 2 ,371,127

FLOATING REAMER Filed NOV. 1, 1943 l l l l l l l-l l l'l'l l'l INVENTOR.Y FRANK VCALHOUN A TTORNE Y' Patented Mar. 13, 1945 ,mesne' assignments,to

Cleveland; Oh|o, a corporatlon ot' Ohio j Application November 1, 1942,serial No. mm Agr es} -L-717- This. invenjtion relates to: animprovement in floating: reamers and has as a primaryobje'ct-to providea self-centerin'g, floating reamer of"simmined-construction to overcomethe former dif-' flcul ty in holding reamer blades securely withinstreamer banduringa'reamingoperation; I

"Another object is to provide asimple-m'eansof adjhstingthe amount offloat in aream'er without removing the reamer bar from the tool holder.--Anotherobjectistoprovide in the-construction ofi' a'reamer b'afmeansfor allowing the-reamer barto be centered in a' grinding machine forgrinding the-reamer blades without removing the bladesirom the reamerbar. 1 I

Still another object is to provide-asingle-mean for holding a reamer barwithina tool holder and for controllingthe amountof float of thereamerdiiringa reaming-operation;

' With-these andfother objects in mind, the in? l vention resides in thecombination of parts and irrtlie details of construction and-operationhere inafter set forthin the following specification 7 and'appendedclaims, certain embodiments thereof being illustrated inthe accompanyingFigure 5 is an isometric view of the wedge ad justing means of thereamer; and

Figure 6 is an end view of the reamer blade shown in Figure 4. l

Referring more particularly to Figure 3 of the drawing, a reamer bar 2is shown as having two similar reamer blades 3 and 4 adjustably insertedtherein in a longitudinal slot I. A wedge 5 having bevelled surfaces I4and 5 is located in the slot II also,- between blades 3 and 4, andcontacts the similarly bevelled surfaces l3 and I6 of thereamer bladesrespectively.

reamer blades' a and 4 are adjusted t a: desired diameter by'means ofadjusting screwt. As it is turnedproperly, this screw engages morethreads in the tap III of: wedge 5 drawing the wedge toward the screwhead. This movement of'th'e wedge forces the blades 3 and 4 outward;since-bevelled surfaces l4 and I5 of the wedge contact-surfaces I 3" andN3 of the" blades respec ti'vely.= .i it i. l

-When the desired adjustment ofthe blades is obtained; thetwoset'scre'ws' 1' and dare'tighteried, thereby holding blades? and 4,respectively, fixed imposition. 'Ih'e positioningofthese setscrews isconsidered unique in that the blades" are fixedly held by the resultantforce-of the tighten ihgfacti-bnof the screws on -the blades, sincethecontact '-between the screws and the blades is 'made-bythe' bevelledsurfaces l8 and; i9. By

A screw 6 having a bevelled head ll is shown projecting through bore I2of the reamer bar into a tapped hole II] in the wedge 5. Two set screws1 and 8 are shown extending through the utilizing this resultant" forcemeans'for firmly fixing a blade within a'reamer bar, the blade is heldin tight -friotional engagement with two sides of" slot"|'| instead ofone, which would be the caseif the set screw merely directly contactedone side of the blade: p InFigures 1 and 2; the reamer or Figure 3 isshown inserted in slot 20' of cylindrical ,tool holder I. A pair ofsc'rews22 and 23 having bevelled end portions are positionedin holder' Iso as 'tobe at right angles'to slot- 2'4 and to the longitudinal axis ora member "9. When thereamer i s placed in slot 20 member 9','having aconical'tip'25, ismoved by tightening screw 23 and loosening screw 22 sothat the conical tip 25 engages conical detent 2| in the reamer bar. Themember 9 along with its adjusting screws thereby provides a means forretaining the reamer in slot 20 while at the same time permitting thereamer to float any desired amount within the limits of the size ofdetent 2| and the amount of engagement of detent 2| by the cone portion25 of member 9.

"The purpose in having the detent 2| coaxial with the hole l2 which islocated on the opposite side of the reamer blades in reamer bar 2 is sothat two centers of a grinder may engage either side ofsaid reamer barto hold thereamer blades in a position for grinding following theremoval of adjusting screw 6 from the hole l2. It should be noticed thatthe entrance to hole I2 is bevelled reamer bar 2 in such a manner thattheir bevelled head surfaces |8 firmly engage the similarly bevelledsurfaces IQ of the blades 3 and 4.

Prior to insertion into the tool holder |,'the

at an angle similarto the slope of the cone-shaped detent 2| for thepurpose of receiving two similarly shaped grinder centers.

Thus it is seen that this construction not only simplifies themanufacture and lowers the cost of this type of reaming tool, but alsoprovides a simple and practical means for holding reamer blades in areamer bar and an adjustable floating means suitable to most reamingapplications.

I claim:

1. A reamer comprising a blade holding bar, said bar havingalongitudinal slot therein, a pair of oppositely disposed reamer bladeshaving an angular cross section andhavingbevelled surfaces at one endinserted in said" slot, a wedge having a centrally located tap disposedcentrally in said slot between the reamer blades and nor-, mallymaintaining contact with the bevelled end surfaces of said blades, anadjusting screw pro+.'

jecting through the reamer bar at right angles to the bar slot andengaging the threads. of the" tap in said wedge, and a pair of setscrews having bevelled heads, one screw being located at substantiallythe mid point between the wedge adjusting screw and the ends of thereamer bar on, either side of said adjusting screw, projecting throughthe reamer, bar from opposite sides at right angles to the bar slot atvapoint adjacent elledsurfaces atone end inserted in said slot, a

wedge having a centrally located tap disposed centrally in said slotbetween the reamer blades and normally maintaining contact withthe beY?elled end surfaces of said blades, 2. bevelledhead adjusting screwprojecting through the reamer bar at right angles to the bar slot andengaging the threads of the tap in saidwedge, and av pair of set screwshaving bevelled heads, one screw being located at substantially the midpoint between the wedge adjusting screw and the ends of the reamer baron either side of saidadjusting screw, projecting through thereamer barfrom opposite sides at right angles to, the bar slot at a point adjacentto one side of a reamer blade so that only the bevelled screw headsengage one of the angular surfaces on a reamer blade, a single means forlocating said bar in its holder andada centrally located tap disposedcentrally in the justing the float thereof, said means comprising acentrally located conical detent in one side of the reamer bar, the axisof said detent being coaxial with the axis of the wedge adjusting screwand a single member disposed in said holder at right angles to said barto progressively engage said detent. v

3.. A reamer comprising a blade holding bar, a tool holder forreleasably holding said bar said bar having a longitudinal four-sidedslot therein,

.1 a pair of oppositely disposed octagonally shaped reamer blades havingbevelled inner end surfaces and mounted in the slot within the reamerbar in normally close frictional engagement with the four sides of thereamer bar slot, a wedge having bar slot between the reamer blades andnormally maintaining contactwith the bevelled end surfaces of theblades, a bevelled head adjusting screw projecting through a similarlyshaped hole in the reamerbar at right angles to the bar slot andengaging the-threads of the wedge tap,'a pair of bevelled headset screwsadjustably carried by said reamer bar, one located adjacent to a reamerblade, and a centrally located conical detent in one side of thereamerbar, the axis of said detent being coaxial with the axis of the hole orthe wedge adjusting screw to permit the reamer bar to beengaged bycenters of a grinder, upon remov-, al of the adjusting screw, andtherebyiacilitate the grinding of the reamer bladeswithout removing saidblades from the-reamer bar, and a single adjustable element disposed insaid tool holder at right angles to said bar to progressively engagesaid conical detent.

4. In a reamer, a pair of cutters and a carrying bar therefor, saidcutters extending beyond the ends of the bar, wedge means located insaid bar intermediate the adjacent inner ends of said cut- FRANK V.CALHOUN.

